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Determination Method Of Coal Mining
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Research on Gas Content Determination Method of Coal Mine …
The prevention and control of coal mine gas disaster are both crucial and challenging to mine safe production.The core issue lies in the accurate determination of coal seam gas content and ...
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Determination of the rock mass displacement zone by …
Coal Mine, Vietnam Tien Trung 1Vu *, Son Anh Do1 1 Hanoi University of Mining and Geology, ... In addition, field survey methods and statistical analysis methods are used. Findings.
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An investigation into the disturbance effects of coal mining …
Coal mining disturbs surface ecosystems in coal mining subsidence areas. Based on the groundwater–surface composite ecosystem analysis, we constructed an ecological disturbance evaluation index system (18 indices) in a coal mining subsidence area using the analytic hierarchy process (AHP). Taking the Nalinhe mining area in …
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Calorific Value, Coal Analysis, Kentucky Geological Survey, …
A measured sample of coal is completely combusted in a bomb calorimeter, which is a device for measuring heat (ASTM method D5865-12; American Society for Testing and Materials, 2013, p. 648–666). Samples are mixed in a container under ASTM guidelines and then the "bomb" container is placed in the calorimeter for automated …
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Rapid Determination of Gross Calorific Value of Coal Using …
In this study, the gross calorific value (GCV) of coal was accurately and rapidly determined using eight artificial intelligence models based on big data of 2583 observations of coal samples in the Mong Duong underground coal mine (Vietnam). Accordingly, the volatile matter, moisture, and ash were considered as the key variables …
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Analysis of distribution method of designed air quantity in coal mine …
In a coal mine, air leakage exists in some roadways through doors and other ventilation structures inevitably. Based on this opinion, there are different views on whether these roadways must be assigned airflow in coal mine ventilation design. ... Analysis of distribution method of designed air quantity in coal mine ventilation-a case …
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Sampling and Sample Preparation
Sample preparation includes drying (in air), as well as crushing, dividing, and mixing a gross sample to obtain a sample that is ready for analysis.
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Coal
Today, almost a third of American coal mines use longwall mining. Outside the U.S., that number is even higher. In China, the world's largest coal producer, more than 85 percent of coal is exracted using the longwall method. Underground Mining: Room and Pillar In the room-and-pillar mining method, miners carve a "room" out of coal ...
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Methods for determination of coal carbon in reclaimed …
Surface mining, also known as opencast mining, is the method of choice when (a) the coal seam is relatively shallow (40 to 50 m), (b) the overburden consists of …
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Determination of sulfur in coal using direct solid sampling …
1. Introduction. Coal is, and will remain for at least a few more decades as a major source of energy in many countries of our world. The content of trace and minor elements in coal is clearly relevant to any environmental aspect during mining, beneficiation and usage [1].Sulfur is one of the most important elements, which can be …
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Research on production capacity planning method of open-pit coal mine
Analysis of the mining status of the Baorixile open-pit coal mine in Fig. 2 shows that the main technical problems are: a large part of the north side of the 2nd mining district has been covered ...
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A new approach to estimate fugitive methane emissions from coal mining
Consulting the Chinese safety industry standard for the "predicting method of mine gas emission rate" (AQ 1018-2006), for single coal seam mining, the mining influence coefficient may vary from 1.3 to 1.6, wherein 1.3 shall be chosen when the direct roof and floor of the active coal seam is shale, while 1.6 corresponds to carbonaceous or ...
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Determination of optimal mining width for coal mining …
In the coal mine, backfill mining method is used, and the gangue gypsum filling materials was used, by using this materials, the gangue generated during the coaling process was fully used and the ...
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Coal Sampling and Analysis Standards
A report on the methods and procedures for sampling and analysing coal, based on a survey of international and national standards. It covers topics such as sampling …
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Study on surface subsidence prediction method of shallow coal …
The backfill-strip mining is gradually applied to shallow coal seam mining for buildings protection because of its good effect, high resource recovery rate, and low filling cost (Guo et al. 2004; Wang et al. 2015a, b; Li et al. 2016; Zhu et al. 2019a, b).The traditional subsidence prediction method in backfill-strip mining is to divide the mining …
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Analysis of Formation Mechanism of Slightly Inclined …
In this paper, the formation mechanism of a slightly inclined bedding mudstone landslide in the overlying mountain of the coal mining subsidence area of the Tanshan Coal Mine in Ningxia, China, is studied. By means of geotechnical investigation, indoor geotechnical tests, theoretical analysis and other technical means, we find the …
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Comprehensive evaluation of ecological environment quality of mining
In order to explore the effective method for the comprehensive evaluation of ecological environment quality of environmental pollution governance in China's coal mining areas, based on the review of domestic and foreign research literature and the requirements and actual situation of environmental pollution control in China's coal …
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The Modified Direct Method: A Solution for Obtaining …
The direct method test was developed for general mine safety applications by the U.S. Bureau of Mines in the early 1970's to measure the gas content of coal samples obtained from the relatively shallow depths of eastern U.S. coal mines.
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Analytical method of reservoir capacity of underground …
Currently, 35 coal mine underground water reservoirs have been established in the Shendong mining district and 95% of the water used for industrial, ... The foregoing analysis reveals the prediction method of water storage capacity in a horizontal mining district. However, the majority of coal resources are inclined seams, and the …
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Method of Identifying Total Sulfur Content in …
The research of sulfur content and logging parameters in coal seams is of great significance for accurate mining and efficient utilization of coal. Taking 81 coal samples collected from the Upper …
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Energies | Free Full-Text | A Disturbed Voussoir Beam …
Due to historical and technological limitations, China's residual coal reserves are estimated to be around 40 billion tons, of which 34% to 45% needs to be mined through upward mining [].Feasibility determination is the core prerequisite for upward mining [2,3].The current methods used to determine the feasibility of upward mining have …
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A rapid and accurate direct measurement method of …
Gas diffusion law and model of coal particles are the fundamental theoretical bases for determining gas content. At present, the semi-empirical formula …
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Structure Partition and Reasonable Width Determination of …
Because the formation of the mine-pressure-influenced plastic zone lies in the gradual failure of coal wall caused by coal strength failure, which is a continuous process, and the determination of stress concentration coefficient K is a reflection of the degree of secondary disturbance of coal seam subjected to coal pressure. It is the result ...
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Understanding coal quality and the critical importance of …
This article discusses the importance of comprehensive coal analyses for coal utilization, research, and environmental and health issues. It explains how coal …
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Evaluation of eco-environmental quality for the coal-mining …
Evaluation methodology. Figure 2 exhibits the procedures and methods of constructing an EEQE evaluation system of the mining area. We select the indicators that can reflect the ecological ...
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Subsidence prediction of overburden strata and ground surface …
According to physical simulation and theoretical model, the maximum surface subsidence of -2 seam mining in Ningtiaota coal mine are 1.1 m and 1.07 m respectively, which is basically ...
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Advances in coal mining technology and sustainable mining …
In production panels where pillars will be completely or partially extracted, an FS <1 may be used. In this whole analysis, the most uncertain part is often the determination of the compressive strength of the coal which determines the strength of the pillar. ... Dr. Syd S. Peng has classified underground coal mining method in China …
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Application of set pair analysis method on occupational hazard of coal
4. Application of AHP-SPA model in coal mines. We chose the Yuan Shop coal mine as a case study to evaluate the proposed method. Yuan Shop coal mine is located in the eastern part of Anhui Province, China, it is the third largest coal mine in Anhui and has received a total investment of 253 million US $ to date.. The occupational …
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Proximate Analysis
The proximate analysis of coal separates the products into four groups: (1) moisture, (2) volatile matter, consisting of gases and vapors driven off during pyrolysis, …
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Development of physical model test system for fault-slip …
The Xinjulong Coal Mine is located in the Juye Coalfield in Eastern China. The No. 2305 S working face of the coal mine has an average depth of −980.85 m, a mining length of 1904 m, and a mining width of 263.5 m. ... Investigation of the effect of caving height on the efficiency of the longwall top coal caving production method …
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Determination of the rock mass displacement zone by …
Based on the analysis of the surrounding rock mass displacements zone, when exploiting the longwall 31104 in Seam 11 at the Nui Beo Coal Mine, the affected boundary on the topographic surface has ...
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Analysis of distribution method of designed air quantity …
method to distribute air quantity in coal mine ventilation design, and then provide the mine operator with the essential opinions and e˙ective operations for day-to-day management in a coal mine ...
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The graded warning method of coal spontaneous combustion in Tangjiahui Mine
Based on the above studies, the working safety management department has divided the coal spontaneous combustion process into three stages in the Safety Regulations in Coal Mine, namely the latent stage, self-heating stage, and combustion stage [34] (Fig. 1).However, the typical gas and its critical value, spontaneous …
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Coal and Coal Mining
Learn about the types, uses, and production of coal in the United States, as well as the different methods and challenges of coal mining. See maps, diagrams, and examples …
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Direct Method Determination of the Gas Content of …
Direct Method Determination of the Gas Content of Coal: Procedures and Results By W. P. Diamond and J. R. Levine UNITED STATES DEPARTMENT OF THE INTERIOR . ... As part of its coal mine health and safety program, the Bureau of Mines has developed a simple, inexpensive test to measure the methane content of ...
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Analytical stress analysis method of interbedded coal and …
After the coal seam is mined, a goaf is formed, and the weight of its overlying strata is transferred to the surrounding coal and rock mass to form the moving bearing pressure area (When the coal seam is mined, the coal rock in front and to the left and right of the excavation workings will share the weight of the overburden rock in the mining …